Abstract
The dynamic structure factor for the well swollen polystyrene (PS)-block-poly(methyl methacrylate) (PMMA) in a semidilute solution (mass concentration c= 0.844c * -2.00c * ) was found to be expressed by the sum of two exponentials in its lower c regions or of three exponentials in the higher c regions, if one component, i.e. the PMMA part, of the block chain was made invisible optically. These two or three modes of motion were discussed in detail with the existing theoretical models which have predicted two normal modes of motion, although the two modes cannot in general be identified with the cooperative and interdiffusion motions due to the coupling between them
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